Yes, Andrew does work in IT
I'd agree with that assessment of Farcebook users age-range. From what little I can see, the local teenies (my kids and their friends) prefer texting, then IM, then email as a backup. Farcebook is seen as something for the pre-OAP's to use, as is - to a lesser extent - Twitter.
"Most of the rest of the world - normal people - only ever used a webmail service as a primary email account."
That's an interesting point - albeit a wrong one (again in my experience). Teenies seem to use the webmail accounts - presumably because they're used to everything being delivered Web2.0 stylee via a browser. Older folks prefer to use a proper email client - be it Outlook, Thunderbird, or any of the others names in the article. That's assuming they can of course.
Look at it sensibly - a web client is fine, but doesn't make all those little niceties - like message filters, local archive, multiple email accounts etc - particularly easy. So if you want/need those then you end up using a mail client by choice. On the other hand if you just want to dash off a quick note, or read one, then webmail is fine.
And then of course, there's the systems like the now departed lycos one - where the webmail system is so slow, buggy, and/or downright unpleasant to use, that an email client-based delivery is the one way to use the service without going mad.
Not a bad article at all - although I think I'll stick with Thunderbird for the time being - using multiple Linux/Windows boxes means that I need something cross-platform, which Outlook definitely isn't.